I paid medical expenses with my credit card and want to reimburse myself from HSA

I paid 600 USD with my credit card (0% apr) for my dentist appointment because I didn't have enough funds in my HSA. Now I want to start reimbursing myself from the HSA every month $100. 

 

Is it that ok? What do I need to do? What will I need to do at the moment of filing my taxes (will I need to itemized)?